Walking cane



FIG. 1 is a side perspective view of a walking cane; and

FIG. 2 is a front plan view thereof;

FIG. 3 is rear plan view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a walking cane, as shown and described. 